CN101268719B - Method and apparatus for monitoring an electrical heating system - Google Patents
Method and apparatus for monitoring an electrical heating system Download PDFInfo
- Publication number
- CN101268719B CN101268719B CN2006800347839A CN200680034783A CN101268719B CN 101268719 B CN101268719 B CN 101268719B CN 2006800347839 A CN2006800347839 A CN 2006800347839A CN 200680034783 A CN200680034783 A CN 200680034783A CN 101268719 B CN101268719 B CN 101268719B
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- heating element
- heating elements
- measurement
- electrical heating
- monitoring
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
- H05B1/023—Industrial applications
- H05B1/0244—Heating of fluids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/78—Measuring, controlling or regulating of temperature
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
- H05B1/0252—Domestic applications
- H05B1/0258—For cooking
- H05B1/0269—For heating of fluids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76003—Measured parameter
- B29C2945/76033—Electric current or voltage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76003—Measured parameter
- B29C2945/76163—Errors, malfunctioning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76929—Controlling method
- B29C2945/76939—Using stored or historical data sets
- B29C2945/76943—Using stored or historical data sets compare with thresholds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/72—Heating or cooling
- B29C45/74—Heating or cooling of the injection unit
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Food Science & Technology (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Control Of Resistance Heating (AREA)
Abstract
The invention relates to a method for monitoring an electrical heating apparatus (1, 3) and to a corresponding apparatus. The electrical heating apparatus (1, 3) has at least one heating element (5, 6, 7, 8, 9, 10). A measured value, which is dependent on the resistance and/or the inductance of the electrical heating element (5, 6, 7, 8, 9, 10), is measured, the measurement being carried out by means of the measured value being sampled. Owing to the use of sampled values, the measurement process can be shortened.
Description
Technical field
The present invention relates to a kind of method of monitoring electric heater unit, described electric heater unit has at least two heating elements.For determining (for example) heating effect or the failure condition of heating element, need to monitor the heating current that flows through heating element.For example, this point is particular importance for the plastic molting process in occurring in plastic-injection moulding machine mould high temperature fluid passage (passage of heat), if because by the plastics of the heating element heat fused less temperature deviation of occurrence degree herein, the material behavior of plastics liquation is affected.This can have a negative impact to the injection process for the preparation of the plastic-injection moulding machine of working of plastics.In plastic-injection moulding machine, plastic grain is also accepted melt processed both in the preplasticizing unit in the plasticization unit that is installed in back, preplasticizing unit.May exist in the mould for the passage of heat that keeps the plastic melting liquid temp.This class plasticization unit and the passage of heat have by the heating element of changing semiconductor relay (current relay) power supply zero point, wherein, can regulate temperature by regulating by the electric current of heating element conduction.Other applications with electric heater unit of heating element for example have air-conditioning equipment and are used for the firing equipment of chemical process, and wherein, also available electric heating system carries out adjustment to the reative cell that is used for chemical process.
Background technology
If the applied field of electric heating system (being electric heater unit) requires very accurate adjustment, with regard to continuing the heating effect of electric heating system is carried out precise monitoring.Certainly, this monitoring not only is embodied as should be low, and its result also should be reliable.In addition, should be in the situation that affect rapidly and not adjustment process and quality and carry out on the measurement of sensitive area.This point mainly refers to the passage of heat.
A kind of known solution is to measure the root-mean-square value of alternating current with summation current transformer.When carrying out the summed current adjusting, the summed current (being the summed current of each electrical heating elements) of electric heating system is measured and analyzed.It is little that the advantage of this processing mode is that technology drops into.But use the shortcoming of summed current adjuster to be, in the adjustment process, all heating elements are all in running order, thereby can only test to the function of all heating elements, and can't check separately heating element.If need to check separately, just must connect pointedly indivedual heating elements, and other all passages must be closed all.This can have a negative impact to adjustment process, because material to be heated may during this period of time cool off.Be temperature sensing material in the situation that controlled plant is swift in response and processes object, this problem can be outstanding especially.
Can carry out rapidly heating current, effectively monitor by the single current detection.This is a kind of reliable monitoring method that can not have a negative impact to the adjustment process.But it is larger that its shortcoming is to drop into, because each heating element of electric heating system must be equipped with transducer (for example current transformer).
Summary of the invention
All there is certain weak point in known electric heater unit monitoring method.The purpose of this invention is to provide a kind of electric heater unit monitoring method that improves to some extent and a kind of corresponding improved equipment arranged.
Method of the present invention is used for electric heater unit is monitored, and wherein, described electric heater unit has at least one heating element.The passage of heat that described electric heater unit for example is used for molten plastic, be used to injecting molding die to comprise regulates temperature, be used for heating liquid or as the heating system of building.Because plastic-injection moulding machine has high requirement to the control quality of controllable electric heater, therefore, applies the present invention to this machine, is favourable.
It is to measure the measured value relevant with the resistance of electrical heating elements and/or inductance that electric heater unit with at least one heating element is carried out the method for monitoring, and wherein, this measurement realizes by described measured value is carried out quick sampling.But will provide the passive electrical current transformer of measuring-signal as transducer.Sampling without the measuring-signal of correcting is realized by the high speed A/D conversion device, and described high speed A/D conversion device can be sampled to the electric current envelope of alternating current.
By measured value (for example being curtage) is sampled, can record the characteristics of signals of measured value.So just need not signal to be corrected again, also need not to carry out long-term analogue value conversion by tooth method, this analogue value conversion needs the lasting turn-on time more than one second or one second.In the case, the measured value of available measuring equipment measurement different heating element.In addition can be in the situation that continue turn-on time and shorter heating current measured.
If electric heater unit has at least two heating elements, and can jointly measure the measured values relevant with resistance electrical heating elements and/or inductance at least two heating elements by a measuring equipment, just can advantageously in control procedure, detect the electric current envelope of summed current, and this electric current envelope is compared with the rated value of summed current.By the single current addition with the heating current of firm controlled device access, just can obtain the rated value of summed current, wherein, can be detected described single current by (for example) training process (Teachen).This information by the control appliance real-time Transmission to monitoring equipment.This message transmitting procedure preferably is connected by the shorter high-speed synchronous of control unit and the length between the monitoring equipment to be realized.So just need not to be switched on or switched off pointedly again single controller and carry out above-mentioned measurement.
If need to carry out all or part of adjusting to the energising situation of at least one heating element, just in a half-wave of alternating current or a few half-wave, carry out, wherein, the value that measures is compared with comparison value.Regulate by the energising situation to heating element, just only need the measured value of a heating element of record.By for quantity to be measured uses sampled value, just need not again heating element to be disconnected the long period in several seconds.
If what supply with for heating element is alternating current, the time of one or more half-waves just is enough to measure.Its advantage is, monitoring can't exert an influence to adjustment, and wherein, electric heater unit is this thermoregulator actuator.By regulating, can heating element be switched on and off different time spans by different orders, different compound modes.In the case, indivedual heating element can be in the irregular time interval operating state of disconnection.Monitoring equipment can be by measuring the fault heating element with exclusive method to the operating state of heating element of storage and the measured value analysis of storage.
In addition, in order (also to be a kind of equipment to electric heater unit, also can be described as " electric heating system ") monitor, advantageously at least two heating elements, the value relevant with the resistance of electrical heating elements and/or inductance measured jointly, again measured value is compared with comparison value subsequently.The value relevant with resistance of electrical heating elements for example is that magnitude of voltage is that electric current under the known case or current value are the voltage under the known case.The common measurement of the value relevant with the resistance of electric heater unit or inductance is mainly realized by the share sensor that is used for measuring curtage.This value that measures is processed by treatment facility, and wherein, described treatment facility is in particular a monitoring equipment, for example is a control appliance or conditioning equipment.For example, this processing realizes by measured value or different measured values are compared with the rated value of storing.
Also the measured value of the first electrical heating elements can be got measured value with the second electrical heating elements and compare, wherein, suppose that there is not obvious deviation to each other in the measured value of same electrical heating element.
If greater than predetermined maximum difference, just producing, deviation reports to the police or fault-signal.This comparative example is as carrying out within being used for thermoregulator control or conditioning equipment.Carry out the monodrome measurement in millisecond scope for the conventional func of electric heating system and each electrical heating elements being monitored, being preferably in.But also can be in the situation that for heating element supply alternating current or alternating voltage, the precise time characteristic of curtage be measured.For this reason, using the high speed analog input that the measured value that provides transducer to record is provided in control or conditioning equipment, is favourable.By for control or conditioning equipment (can realize according to sampling thheorem the measurement of measurement point) outfit transducer and analog input end, just can monitor indivedual electrical heating elements by measuring in short-term.Measure by within shorter turn-on time, carrying out fast current characteristics, also can in the situation that machine measure reliably not affecting adjustment process by the heated at high speed electric current when being in the running-in state.
A kind of favourable implementation of method of the present invention is to make measurement and triggering signal synchronous.Can obtain repeatably measurement result synchronously by making to measure with triggering signal.For example, the mistake zero crossing of alternating current or alternating voltage is exactly a kind of triggering signal.
Another implementation according to described method, for in the situation that do not affect other electrical heating elements groups indivedual electrical heating elements or one group of electrical heating elements are monitored, in measuring process, carrying out all or part of adjusting to the energising situation of at least one heating element or one group of heating element.If the use triggering signal just can be measured from sometime beginning, the energising situation to a part of electrical heating elements in this measuring process is regulated.This point (for example) realizes by the shutoff variable flow valve or by relay is controlled by current transformer in galvanization.
If come mutually to be the electrical heating elements power supply with at least two electricity, just can advantageously for one of them arranges (for example) transducer mutually, wherein, can be mutually two or more electrical heating elements power supplies by one.Connected mode between the electrical heating elements or for the series connection, perhaps be the parallel connection.
If be that two electricity are measured with a transducer mutually, then during the electric current in measuring first-phase, the electric current on the second-phase can be inhibited.
According to a kind of favourable implementation of described method, described method is used for heating element is monitored, and described heating element is used for molten plastic or is used to the passage of heat of mould to regulate temperature.This implementation relates generally to the application of described method in plastic-injection moulding machine.For this class machine, can carry out accurate adjustment particular importance to the plastics liquation, because temperature has a significant impact the material behavior tool of plastics liquation, thereby also can produce a very large impact the prepared injection-moulding plastic spare of plastic-injection moulding machine.
A kind of favourable implementation is to monitor with monitoring equipment, this monitoring equipment has one for detection of the intelligent apparatus of heating current, wherein, this intelligent apparatus obtains the relevant information which section of a heater is switched on or disconnects in plastic-injection moulding machine.Therefore, in plastic-injection moulding machine, the section of an electric heater unit can be switched on or switched off by regular hour rhythm (ein-und austaktbar).A section of electric heater unit has at least one heating element.
For example, monitoring equipment can be embodied as take several milliseconds as the interval input current (alternating current of namely changing at zero point) is carried out quick sampling.The heat wave of each connection can be measured.So just can save the self-oscillating of built-in transducer.
In further treatment step, monitoring equipment compares specified summation heating current and actual summation heating current in real time.For this reason, monitoring equipment obtains the relevant information that is switched on or switched off heating current by regular hour rhythm.This point can realize by peripheral bus (for example PROFIBUS bus).Rated value also is stored in monitoring equipment inside.System can obtain this information.Each adjustment process can be monitored.This point can guarantee to send rapidly fault-signal.Only under failure condition, just need the section of electric heating system individually is switched on or switched off by regular hour rhythm, in order to fault section is positioned.In this process, thermoregulator or temperature-adjusting device neither can be affected, and also can not interrupted.The reason why this point can realize mainly is to use shorter Measuring Time.
Therefore, can be simply by monitoring with sampled value by method of the present invention.In addition, can realize fast and reliably monitoring by described method, its reason is and can measures in real time.Another favourable part is, because for current monitoring, can be specially the section of electric heater unit be switched on or switched off by regular hour rhythm, and therefore, quality of regulation can not affect adversely.
According to a kind of favourable implementation, by being switched on or switched off by regular hour rhythm, the electrical heating elements for the heating system of controlling temperature monitors simultaneously these electrical heating elements.
According to another implementation of described method, monitoring equipment links to each other with adjusting and/or control appliance, to carry out transfer of data.Adjusting and/or control appliance are used for regulating or the control temperature.For realizing this process, by this equipment heating element is connected and/or disconnection, perhaps provide different rated current intensity for it.That is to say, can determine the rated value that summed current is measured by adjusting and/or control appliance.This rated value is compared with the actual value that measures.Owing to by order conduction time of regulating and/or heating element also can be determined and store to control appliance, thereby can be undertaken relatively realizing monitoring with the logic of time correlation by rated value and actual value to measured value.Can be by the logic exclusion method by the heating element measurement of the connection of making up by different way being measured the fault of heating element.
The below is illustrated this: the related heater of this example has five heating elements 1 to 5.In the situation that heating element 3 breaks down, can find this situation by following measurement, wherein, only carry out all measurements with a transducer, simultaneously the electric current of all heating elements is detected by this transducer.
In the situation of heating element 1 and 2 for the heating element connected, carry out current measurement: actual value=rated value (heating element 1 and 2 is normal)
In the situation of heating element 3 and 5 for the heating element connected, carry out current measurement: actual value ≠ rated value (actually or can't find out that from current measurement fault has occured heating element 3 heating elements 5)
In the situation of heating element 1 and 4 for the heating element connected, carry out current measurement: actual value=rated value (heating element 4 is also normal)
In the situation of heating element 3 and 4 for the heating element connected, carry out current measurement: actual value ≠ rated value (can find that by current measurement fault has occured heating element 3, because determined that before heating element 4 is normal).
By be used for to regulate and/or the adjusting of control heating element and/or control appliance 15 and monitoring equipment between the exchanges data of heating element of relevant connection, and by definite kilter and definite defective mode (Real-time Collection and storage) are carried out logical operation, can draw the kilter of relevant one or more heating elements or the conclusion of defective mode (being fault).This logical operation is for example carried out in monitoring equipment.Monitoring equipment can all or part ofly be built in adjusting and/or the control appliance.
The connection of heating element order is relevant with adjusting and/or control appliance in the above-mentioned example, preferably, is not subjected to the impact of monitoring equipment.
Equipment for the monitoring electric heater unit of the present invention comprises one for the transducer that measured value is sampled, wherein, electric heater unit has a heating element or at least two heating elements that are connected in parallel to each other or can switch on separately, and measured value is relevant with resistance and/or the inductance of electrical heating elements.
Another implementation that is used for the equipment of monitoring electric heater unit (having at least two heating elements that are connected in parallel to each other or can switch on separately) according to the present invention, be provided with for a transducer that value is measured jointly to two heating elements, this value is relevant with resistance and/or the inductance of electrical heating elements.Wherein, if available at least two relays are powered respectively at least two heating elements, be favourable.Preferably, with the wherein a kind of method in the corresponding device enforcement said method.
Described equipment can carry out following expansion: but monitoring equipment links to each other with adjusting and/or control appliance in the mode of the transmission of data, wherein, adjusting and/or control appliance are used for regulating and/or the control heating element, and what transfer of data related to is the data of the on-state order of relevant heating element.
Described method and described equipment are applied to plastic-injection moulding machine, are particularly advantageous.In plastic-injection moulding machine, need just accurately to reach accurate adjustment and monitoring, in order to reach the purpose of the plastic product quality that improvement produces.
Description of drawings
Below by the embodiment description advantage of the present invention and details are described further, wherein:
Accompanying drawing is the electric heater unit in the plastic-injection moulding machine.
Embodiment
Accompanying drawing shows is a symbolically injecting unit 25 of illustrated plastic-injection moulding machine 20 in addition.Injecting unit 25 has injection ram 26.Injection ram 26 can carry out traveling priority in piston-type hydraulic cylinder 28 under the effect of linear drives unit 27.With reference to the accompanying drawings, injection device and plasticizing apparatus are separated from each other.When plastifying, can carry (for example) plastic grain 30 to screw rod 31 by funnel 29.Can carry plastic grain 30 towards the screw rod tip 32 directions by screw rod 31.In the process of carrying pellet 30, can pellet be melted by electric heater unit 1.In the present embodiment, electric heater unit 1 has three heating elements 5,6 and 7.Can be each electrical heating elements 5,6 and 7 power supplies by electric connection line 11.Can measure the electric current that flows through electric connection line by transducer 12.Transducer 12 is connected on the monitoring equipment 14.This monitoring equipment 14 is compared the current actual value that measures with the rated value of storing.If one of them heating element 5,6 or 7 heat(ing) coil burn under failure condition, just can be by actual value and rated value relatively determine this fault.But monitoring equipment 14 links to each other with adjusting and/or control appliance 15 by the mode of data link with the transmission of data.Adjusting and/or control appliance 15 self link to each other with relay 19 by data link 41 again.Relay 19 is connected on the three-phase alternating current 43.
Heater also is used as mold heating device or nozzle heating device in plastic-injection moulding machine.But accompanying drawing does not illustrate these heaters.
Plastic grain by electric heater unit 1 heat fused enters melt memory 34 by rotatablely moving of screw rod 31.Screw rod 31 sustainable work because melt can be temporarily stored in the melt memory 34, and are transported in the piston-type hydraulic cylinder by melt memory 34.The reason why this point can realize is, the size of melt memory 34 can change under the effect of memory piston 36 (namely become large or dwindle).When melt memory 34 dwindled, melt just was pressed in the piston-type hydraulic cylinder 28 from memory opening 38.Be furnished with other electric heater units 3 that can further heat melt in piston-type hydraulic cylinder 28 zones.According to favourable scheme, screw rod 31 continues to carry the plastics liquation to melt memory 34, until injection ram 26 is finished injection and pressurization.When again carrying out injection process, need again in piston-type hydraulic cylinder 28, to be pressed into melt by memory piston 36.
Electric heater unit 3 and electric heater unit 1 be the same to have a plurality of heating elements 8,9,10.Electrical heating elements 8,9,10 is connected on the relay 16,17 and 18 by electric connection line 11, and wherein, these relays respectively have an ac terminal 42.According to favourable scheme, these relays 16,17 and 18 are semiconductor relays, because semiconductor relay can be realized fast operating process and frequently mode of operation conversion.Also available current transformer replaces relay.Monitoring equipment 14 can advantageously be built in for control relay 16,17 and 18 adjusting and/or control appliance 15.Adjusting and/or control appliance can be built in one or more current transformers or the relay, but accompanying drawing does not illustrate this yet.Accompanying drawing has just carried out symbol diagram on the whole to the relay of electric heater unit 1.
Can control relay 16,17 and 18 by two-position controller simply.Relay 16,17 with 18 be used for to measure electric connection line 11 in the transducer 12 of electric current link to each other.Not only but relay 16 is crossed in convection current, 17 and 18 electric current is controlled (because transducer 12 detects its actual values) by transducer 12, also can control heating element 8,9,10 functional reliability.If there is heating element 8,9,10 to break down, its rated resistance will be different from actual resistance (drawing according to the calculated with actual values that measures).The heating element 8,9 of electric heater unit 3,10 monitoring function are incorporated in one or more relays 16,17 or 18.Each heating element 8,9,10 is all for specific region 22 of heating, 23 and 24.Heating process is carried out in a controlled manner, wherein, in the adjustment process of heating-up temperature, can keep higher quality of regulation.For avoiding quality of regulation to be subject to unnecessary adverse effect, only within the time of a half-wave of alternating current or a few half-wave, carry out monitoring function, heating element 5,6,7,8,9 and 10 function are monitored.In carrying out the process of monitoring function, only be a heating element energising, therefore, 12 of transducers are measured this energising heating element 5,6,7 measured value.That is to say, only need to use a transducer 12 just can monitor (referring to the diagram of relevant electric heater unit 1) to a plurality of heating elements 5,6,7.
Claims (10)
1. the method for a monitoring electric heater unit (1,3), described electric heater unit has at least two electrical heating elements (5,6,7,8,9,10), wherein, to at least two electrical heating elements (5,6,7, measured values relevant with resistance described heating element and/or inductance 8,9,10) are measured jointly, wherein, by being sampled, described measured value realizes described measurement
It is characterized in that,
Described measurement was carried out within the time of a half-wave of alternating current or a few half-wave, and during described measurement at least one electrical heating elements (5,6,7,8,9,10) energising situation is carried out all or part of adjusting, and the value that will measure is again subsequently compared with a comparison value.
2. method according to claim 1 is characterized in that,
Described measurement and a triggering signal are synchronous.
3. method according to claim 1 is characterized in that,
Come mutually to be described heating element (5,6,7,8,9,10) power supply with at least two electricity, the value that jointly measures relates at least two electric phases, in the process of carrying out described measurement, only has an electricity to switch on mutually.
4. method according to claim 1 is characterized in that,
Described heating element (5,6,7,8,9,10) is used for molten plastic, and this relates to the application in plastic-injection moulding machine (2 0).
5. method according to claim 1 is characterized in that,
Monitoring equipment (14) links to each other with adjusting and/or control appliance (15), and to carry out transfer of data, described adjusting and/or control appliance (15) are used for regulating and/or controlling described heating element (8,9,10), wherein, regulate and/or control data and be used for monitoring.
6. one kind is used for the equipment that enforcement of rights requires the method for 1 described monitoring electric heater unit (1,3), and described electric heater unit has a heating element (5,6,7,8,9,10) or at least two electrical heating elements that are connected in parallel to each other (5,6,7,8,9,10) or the electrical heating elements (5 that can power separately, 6,7,8,9,10)
It is characterized in that,
Being provided with one is used for measuring and described electrical heating elements (5,6,7,8,9, the transducer of the value that resistance 10) and/or inductance are relevant, wherein, further be provided with one for the instantaneous value transducer (12) that carries out described measurement, and provide adjusting and/or the control appliance that to realize the measurement of measurement point according to sampling thheorem, described adjusting and/or control appliance are provided with transducer and analog input end, by the measurement within the time of a half-wave of alternating current or a few half-wave indivedual electrical heating elements are monitored.
7. equipment according to claim 6 is characterized in that,
At least two heating elements (5,6,7,8,9,10) can be powered respectively by at least two relays (16,17,18).
8. according to claim 6 or 7 described equipment, it is characterized in that,
One monitoring equipment (14) links to each other with adjusting and/or control appliance (15), and to carry out transfer of data, described adjusting and/or control appliance (15) are used for regulating and/or controlling described heating element (8,9,10).
9. equipment according to claim 6 is characterized in that,
Described equipment is used for implementing method according to claim 1.
10. a plastic-injection moulding machine (20), described plastic-injection moulding machine has equipment according to claim 6.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102005044831.3 | 2005-09-20 | ||
| DE102005044831A DE102005044831A1 (en) | 2005-09-20 | 2005-09-20 | Method and device for monitoring an electric heater |
| PCT/EP2006/065264 WO2007033872A1 (en) | 2005-09-20 | 2006-08-11 | Method and apparatus for monitoring an electrical heating system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101268719A CN101268719A (en) | 2008-09-17 |
| CN101268719B true CN101268719B (en) | 2013-03-27 |
Family
ID=37126503
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006800347839A Expired - Fee Related CN101268719B (en) | 2005-09-20 | 2006-08-11 | Method and apparatus for monitoring an electrical heating system |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US8269513B2 (en) |
| EP (1) | EP1927267A1 (en) |
| JP (1) | JP4959708B2 (en) |
| CN (1) | CN101268719B (en) |
| DE (1) | DE102005044831A1 (en) |
| WO (1) | WO2007033872A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007059781A1 (en) * | 2007-12-12 | 2009-06-18 | Psg Plastic Service Gmbh | Operation of plastics-processing heating equipment with several heating circuits, controls sum and ratios of heating energy supplied to each circuit, minimizing electrical demand |
| US8674544B2 (en) * | 2009-01-26 | 2014-03-18 | Geneva Cleantech, Inc. | Methods and apparatus for power factor correction and reduction of distortion in and noise in a power supply delivery network |
| EP2389714B1 (en) * | 2009-01-26 | 2019-07-24 | Geneva Cleantech Inc. | Methods and apparatus for power factor correction and reduction of distortion in and noise in a power supply delivery network |
| EP2555585B1 (en) * | 2011-08-01 | 2017-07-05 | Siemens Aktiengesellschaft | Power supply device for a jar heater and method for its operation |
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- 2005-09-20 DE DE102005044831A patent/DE102005044831A1/en not_active Withdrawn
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2006
- 2006-08-11 EP EP06792796A patent/EP1927267A1/en not_active Withdrawn
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- 2006-08-11 US US11/992,326 patent/US8269513B2/en not_active Expired - Fee Related
- 2006-08-11 JP JP2008531642A patent/JP4959708B2/en not_active Expired - Fee Related
- 2006-08-11 CN CN2006800347839A patent/CN101268719B/en not_active Expired - Fee Related
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| CN101268719A (en) | 2008-09-17 |
| WO2007033872A1 (en) | 2007-03-29 |
| US8269513B2 (en) | 2012-09-18 |
| US20100060291A1 (en) | 2010-03-11 |
| DE102005044831A1 (en) | 2007-03-22 |
| JP2009508720A (en) | 2009-03-05 |
| EP1927267A1 (en) | 2008-06-04 |
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